BinaryFlat add 2 Metric: Substructure Superstructure

[shengjun1985]

Is your feature request related to a problem? Please describe.
I want Milvus to support more binary metrics.

Describe the solution you'd like
Here are the 2 Metric.
(1) Substructure: D(a, b) = ((a∩b)==a ? 0 : ∞)
(2) Superstructure: D(a, b) = ((a∩b)==b ? 0 : ∞)

Obviously, these two formulas do not satisfy the following properties.
(1) D(a, b) = D(b, a)
(2) D(a, b) + D(a, c) >= D(b, c)
So, IVF can not supported now.

Describe alternatives you've considered

Additional context

[shengjun1985]

@youny626 Please help to add Java sdk.
@fishpenguin Please help to add Go and C++ sdk.
Thanks.

[BossZou]

Python SDK have add Substructure and Superstructure. You can install pymilvus-test>=0.3.1 to use them. Here is an example to use them in python shell.

[youny626]

Available in java SDK 0.6.0-SNAPSHOT

[fishpenguin]

Go sdk and C++ sdk have added Substructure and Superstructure